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    • Cummins Marine Forum Topics
    • QSM 11 Running Warmer than Normal

      This topic has 3 replies, has 4 voices, and was last updated byRob Schepis 6 years ago

      July 17, 2017 at 7:05 am I have 2 QSM 11 635 hp engines. They are 2002 with about 650 hours. They have both been running right a 180 degrees at 2000 rpm (normal cruise) for years. The port engine has started to climb. A few weeks ago on a 6 hour run it was running about 185 degrees. This past weekend on two 3.5 hour runs it ran at 190 degrees. I am going to replace the raw water impellers (on both) and was thinking that perhaps I should switch to the 160 degree thermost…

      Started by: Bob Hill in: Cummins Marine Engines

      3 Replies
      July 19, 2017 at 5:21 am The 160 Stats should be in the QSM11 marine engine from the factory. All the way from 1999 to present, wet or dry version. Part numbers 4952210 or 4973372 ( starts to open at about 159F, fully open at 174-ish).. On highway and industrial stuff use the higher temp stats AND, I revert to Corey’s post above that chances are the cooling system needs to be Properly Serviced Top to Bottom…sounds like all is original with well over a dec…

      Last Post by: Rob Schepis posted: 6 years ago

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